this is bbc news. i'm kasia madera with the latest headlines for viewers in the uk and around the world. a white police officer who fatally shot an african—american man in atlanta has been charged with murder. as coronavirus cases start to rise again in china, we visit the wet markets blamed by some as the original source and consider the latest theories. a bombshell allegation from donald trump's former national security adviser. he claims the president asked china's leader to help him win re—election. the premier league is back in action, as players open the matches showing solidarity with the black lives matter movement.

or around the world. a former police officer in the us state of georgia has been charged with the murder of rayshard brooks. the unarmed african—american was shot twice in the back as he fled from two white officers in atlanta. garrett rolfe, who was sacked from the police force shortly after the shooting, could face the death penalty if he's found guilty. our north america correspondent nick bryant reports. it started out as a routine call. an african—american reported asleep in his vehicle in the car park of a fast food restaurant in atlanta, georgia. could you step out for me, please? yes, sir. rayshard brooks was asked by police to take a sobriety test. then he suggested he walk to his sister's home nearby. i canjust go home. i have my daughter's bag right now. my daughter's birthday

was yesterday. all right, mr brooks. blah, blah, blah. but after he failed the breath test, the police decided to take him into custody. that's when a fight broke out, in which he seized and fired one of the officers' tasers. stop fighting! you're gonna get tased! during a brief chase, he pointed the taser at the officer, who responded by fatally shooting him in the back. tonight, prosecutors revealed shocking new details that garrett rolfe, the officer who killed rayshard brooks, had kicked him on the floor afterwards, and the other officer, devon brosnan, stood on his shoulders. neither offered any medical help for two minutes. in announcing a felony murder charge against officer rolfe, georgia's attorney general showed a photograph of that kick, and stressed rayshard brooks did not pose a serious threat thatjustified the use of lethal force. the demeanour of the officers immediately after the shooting

did not reflect any fear or danger of mr brooks, but their actions really reflected every kind of emotion. faced with such massive and multiracial black lives matter protests, prosecutors are moving more swiftly to bring charges. what makes this case so especially alarming is that even at a time of heightened racial tensions, a white police officer thought he could shoot an african—american in the back and then kick him on the ground afterwards. it will increase the already urgent demands for a major overhaul of american policing. nick bryant, bbc news, new york. after nearly two months with no coronavirus infections, the chinese capital beijing is being placed under another lockdown. restrictions on movements have been re—introduced to try to contain a new outbreak which emerged a week ago ago and has been linked to the capital's largest wholesale food market.

our correspondentjohn sudworth looks at the latest theories about the origins of coronavirus, and what comes next for the authorities in beijing. wuhan — ground zero, a city of 11 million people, through the streets of which an unseen, silent killer took its first steps late last year... and where the cemeteries hold the first to fall victim to its deadly effects. but, six months on, the origin of this virus is still unclear. most scientists believe china's wet markets should be the focus. the virus, known to come initially from bats, was likely passed to humans, they say, via another species. do people in wuhan eat wildlife? "we don't have customs like that", he says. across town though, this market, connected to some

of the first virus cases, has been closed. wild animals were traded here, but the testing of samples has now ruled it out as the source. but there's another theory. for more than a decade, wuhan has been at the forefront of a major project to collect bat viruses from remote chinese caves. as a result, there are few buildings in the world surrounded by as much controversy as this one right now, at the centre of the us president's accusation that the virus leaked from a lab. inside, researchers have been studying coronaviruses — and sometimes genetically altering them — to better understand, they say, how pandemics might arise. well, the lab leak theory is dismissed by the chinese government and by some scientists as an

outlandish conspiracy. we're told to stop filming. on state tv, the lab has dismissed the allegations of a leak. translation: this is pure fabrication. we first received the sample of the 30th of december. before that, we didn't even know it existed. how could it have leaked from our lab when we never had it? scientists have looked at the structure of the virus itself, in particular its protein spikes, which are unusually good for a coronavirus of this type at binding to human cells. this analysis, by five experts in the field, finds that it was not purposefully manipulated. we do not believe that any type of laboratory—based scenario is plausible, it says — a conclusion now widely accepted.

to deny a possibility when a scientist should always keep an open mind... but some scientists say it's flawed and based in part on accepting the labs denials. one of those possibilities has to be that this came out of a lab. you know, it's a possibility. we can't say it's not, and for my colleagues to say it's not, i'm a bit astounded, because you can't say a negative. certainly, nobody is proving a negative here. china has been developing an origin theory of its own, with state media and officials suggesting it may have come from elsewhere. it's an idea gaining traction in wuhan. "it came from the us", this man says. "they've tested the sequences, the us had it first." leo ochieng, a former communist party official, died of coronavirus injanuary. on the banks of wuhan‘s east lake, i meet his son.

he is angry at china's handling of the outbreak but says calls for an international enquiry offer little hope. translation: if china or the us investigate, the final result will come from a group of politicians. it will be a report infected by politics. the origin of the virus is now meaningless to me. with wu han‘s lockdown receding into memory, the limits of science and the demands of politics may mean the biggest question is never answered — where did the virus come from? john sudworth, bbc news, wuhan. let's get some of the day's other news. angela merkel has announced that germany will extend a ban on large—scale events until at least the end of october. the move is part of efforts to try to avoid a new wave

of coronavirus infections. ms merkel urged people to remain cautious and maintain social distancing. anti—racism campaigners appear to have won their fight to get a statue of the colonialist, cecil rhodes, removed from a college at oxford university. the governing body of oriel college has voted in favour of taking it down. the monument has been the focus of a long—running campaign. the united states has pulled out of international talks